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$168+ Cheap flights from Luis Munoz Marin Intl (SJU) to Ontario (ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
SJU — ONT
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
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Cheap flight deals from Luis Munoz Marin Intl to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Luis Munoz Marin Intl (SJU) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 13, 2025.

Round-trip from

$335
(United Airlines)

One-way from

$168
(Delta)

Popular in

June

Cheapest in

July

Average price

$604
From San Juan Luis Munoz Marin Intl to Ontario
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One-way flight from San Juan Luis Munoz Marin Intl to Ontario
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High demand for flights, 4% potential price rise
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Luis Munoz Marin Intl to Ontario

Cheapest flights from Luis Munoz Marin Intl to Ontario
Explore the most affordable flight options available from Luis Munoz Marin Intl to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This United Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/241:05 amSJU - ONT
2 stops14h 08mUnited Airlines
Sun 9/286:36 pmONT - SJU
2 stops14h 24mUnited Airlines
Deal found 8/12$335
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2512:01 pmSJU - ONT
2 stops14h 58mAmerican Airlines
Sun 9/2811:59 pmONT - SJU
1 stop11h 16mAmerican Airlines
Deal found 8/12$386
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/253:22 pmSJU - ONT
1 stop30h 13mMultiple Airlines
Sun 9/287:15 pmONT - SJU
1 stop18h 03mMultiple Airlines
Deal found 8/12$399
This JetBlue deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/111:25 pmSJU - ONT
1 stop11h 04mJetBlue
Sun 9/2110:56 pmONT - SJU
1 stop13h 00mJetBlue
Deal found 8/10$410
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/252:55 pmSJU - ONT
1 stop9h 29mUnited Airlines
Sat 11/17:00 amONT - SJU
1 stop10h 00mUnited Airlines
Deal found 8/11$425
This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/13:55 pmSJU - ONT
2 stops21h 10mAmerican Airlines
Thu 10/910:29 pmONT - SJU
1 stop13h 26mAmerican Airlines
Deal found 8/12$426
This JetBlue deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/301:25 pmSJU - ONT
1 stop11h 04mJetBlue
Sat 10/1110:56 pmONT - SJU
1 stop12h 58mJetBlue
Deal found 8/12$446
This United Airlines deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/291:05 amSJU - ONT
2 stops14h 46mUnited Airlines
Sat 10/116:51 pmONT - SJU
2 stops14h 09mUnited Airlines
Deal found 8/11$460
This Priceline deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/23:03 amSJU - ONT
1 stop21h 26mJetBlue
Sun 10/510:56 pmONT - SJU
1 stop14h 46mJetBlue
Deal found 8/13$464
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/23:39 amSJU - ONT
2 stops17h 56mMultiple Airlines
Sun 10/54:09 pmONT - SJU
1 stop21h 09mMultiple Airlines
Deal found 8/13$474

Cheapflights Fare Finder

 
Customize your flight search to find flights from Luis Munoz Marin Intl to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 13, 2025.
Use the filters below to find and compare flights from San Juan Luis Munoz Marin Intl Airport to Ontario that are best for you.

Fly from

Luis Munoz Marin Intl

Fly to

Ontario

Route

Depart

Return

Price

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 10/3

3:05 pm-10:33 pm

1 stop10h 28m

Ontario

Sun 10/5

11:59 pm-2:20 pm

1 stop11h 21m

$335

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 9/24

1:05 am-12:13 pm

2 stops14h 08m

Ontario

Sun 9/28

6:36 pm-12:00 pm

2 stops14h 24m

$335

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/25

12:01 pm-11:59 pm

2 stops14h 58m

Ontario

Sun 9/28

11:59 pm-2:15 pm

1 stop11h 16m

$386

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Wed 10/1

3:55 pm-10:05 am

2 stops21h 10m

Ontario

Thu 10/9

10:29 pm-2:55 pm

1 stop13h 26m

$386

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/25

3:22 pm-6:35 pm

1 stop30h 13m

Ontario

Sun 9/28

7:15 pm-4:18 pm

1 stop18h 03m

$399

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/11

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Mon 9/22

10:56 pm-12:42 pm

1 stop10h 46m

$410

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/11

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Sun 9/21

10:56 pm-2:56 pm

1 stop13h 00m

$410

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Thu 9/18

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Sun 9/21

10:56 pm-12:42 pm

1 stop10h 46m

$410

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 9/12

1:25 pm-9:29 pm

1 stop11h 04m

Ontario

Fri 9/26

10:56 pm-1:47 pm

1 stop11h 51m

$410

San JuanOntario

SJU - ONT

SJUONT

San Juan Luis Munoz Marin Intl

Fri 9/5

12:50 pm-7:11 pm

1 stop9h 21m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 19 results
1
2

Best time to book a flight from Luis Munoz Marin Intl to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Luis Munoz Marin Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Juan Luis Munoz Marin Intl Airport to Ontario

What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

Currently, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $246). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SJU to ONT?

Find hourly flight availability from Luis Munoz Marin Intl to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2025.

A simple way to save on the total cost of your ticket is to fly from San Juan Luis Munoz Marin Intl Airport to Ontario in the morning. If you’re flexible enough to do this you can expect to save up to 46% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated August 13, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from San Juan Luis Munoz Marin Intl Airport to Ontario. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,920 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Luis Munoz Marin Intl to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from San Juan Luis Munoz Marin Intl?

    If you book a flight to Ontario from San Juan Luis Munoz Marin Intl, you will be flying to Ontario, which is the city’s only airport. Ontario (ONT) is located 3.1 mi from the center of Ontario. There are 0 flights from San Juan Luis Munoz Marin Intl to Ontario per day from 3 different airlines.

  • What are the cheapest airlines flying from San Juan Luis Munoz Marin Intl Airport to Ontario round-trip?

    Our cheapest airline available from San Juan Luis Munoz Marin Intl Airport to Ontario is United Airlines. Our recent data shows that you can find tickets from as low as $335 on this airline. An additional option worth looking into is American Airlines, starting at $386. Users have found that United Airlines is 33% cheaper than the other options available to this destination.

  • Can I find deals for flights from Luis Munoz Marin Intl to Ontario that include hotel bookings?

    Yes. In addition to deals on Luis Munoz Marin Intl to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Luis Munoz Marin Intl to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Luis Munoz Marin Intl to Ontario.

  • Can I find deals for business class flights from Luis Munoz Marin Intl to Ontario?

    Yes. Cheapflights offers flight deals from Luis Munoz Marin Intl to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario?

    Currently, August is the cheapest month in which you can book a flight from San Juan Luis Munoz Marin Intl Airport to Ontario (average of $246). Flying from San Juan Luis Munoz Marin Intl Airport to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Top 3 airlines flying from Luis Munoz Marin Intl to Ontario

Discover the top 3 airlines that operate flights from Luis Munoz Marin Intl to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$344Average$644FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$355Average$535FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$395Average$734FlexibilityNo cancel feeOn-time69%

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